It means things go in cycles - it's very cute.
What was popular and "in" became "old news" - and then whatever it is/was is rediscovered and exciting and interesting again.
It means I'm older and can remember when people used tea towels, and can remember when they didn't.
I am so happy to see some of the needle crafts becoming popular again.
I remember embroidered dish towels - one for every day of the week - and I still have some of them and use them.